A professor recorded three statistics exam scores and other variables for 20 students in her statistics course. There are seven variables in this data set: (1) ID number, (2) Sex, (3) Study Place, and (4) Hours of Work, (5) Exam 1 score, (6) Exam 2 score, and (7) Exam 3 score.
· Sex (1 = Males, 2 = Females)
· Study_Place ("Where do you study the most frequently for this class?"
1 = My room, 2 = Library, 3 = Coffee shops, 4 = others)
· Work_Hour ("On average, how many hours do you spend for job-related tasks?")
Problem #1 :
Calculate the z score of the average exam score for each case.
a. Show me the scores on all9variables (the original 7 variables, the mean exam score, and its z score) for the first 5cases.
b. What is the z score of mean exam for ID #1? Interpret his z score?
c. Get the mean and SD of the z scores. Review the output; can you locate the mean and SD of the z score distribution? What are the values?
a. Calculate the mean and standard deviation (SD) of the mean exam score separatelyby study place.
b. Construct a bar-graph for study place. The X-axis represents Study Place and the Y-axis represents MEAN exam score.
c. Review the output from 4-a and 4-b. What conclusion can you draw from them? (for example, "Would the location of study be related to average exam score?")